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graph2dot.c
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1 /*
2  * Copyright (c) 2008-2010 Stefano Sabatini
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "config.h"
22 #if HAVE_UNISTD_H
23 #include <unistd.h> /* getopt */
24 #endif
25 #include <stdio.h>
26 #include <string.h>
27 
29 #include "libavutil/mem.h"
30 #include "libavutil/pixdesc.h"
31 #include "libavfilter/avfilter.h"
32 
33 #if !HAVE_GETOPT
34 #include "compat/getopt.c"
35 #endif
36 
37 static void usage(void)
38 {
39  printf("Convert a libavfilter graph to a dot file.\n");
40  printf("Usage: graph2dot [OPTIONS]\n");
41  printf("\n"
42  "Options:\n"
43  "-i INFILE set INFILE as input file, stdin if omitted\n"
44  "-o OUTFILE set OUTFILE as output file, stdout if omitted\n"
45  "-h print this help\n");
46 }
47 
48 struct line {
49  char data[256];
50  struct line *next;
51 };
52 
53 static void print_digraph(FILE *outfile, AVFilterGraph *graph)
54 {
55  int i, j;
56 
57  fprintf(outfile, "digraph G {\n");
58  fprintf(outfile, "node [shape=box]\n");
59  fprintf(outfile, "rankdir=LR\n");
60 
61  for (i = 0; i < graph->nb_filters; i++) {
62  char filter_ctx_label[128];
63  const AVFilterContext *filter_ctx = graph->filters[i];
64 
65  snprintf(filter_ctx_label, sizeof(filter_ctx_label), "%s\\n(%s)",
66  filter_ctx->name,
67  filter_ctx->filter->name);
68 
69  for (j = 0; j < filter_ctx->nb_outputs; j++) {
70  AVFilterLink *link = filter_ctx->outputs[j];
71  if (link) {
72  char dst_filter_ctx_label[128];
73  const AVFilterContext *dst_filter_ctx = link->dst;
74 
75  snprintf(dst_filter_ctx_label, sizeof(dst_filter_ctx_label),
76  "%s\\n(%s)",
77  dst_filter_ctx->name,
78  dst_filter_ctx->filter->name);
79 
80  fprintf(outfile, "\"%s\" -> \"%s\" [ label= \"inpad:%s -> outpad:%s\\n",
81  filter_ctx_label, dst_filter_ctx_label,
82  avfilter_pad_get_name(link->srcpad, 0),
83  avfilter_pad_get_name(link->dstpad, 0));
84 
85  if (link->type == AVMEDIA_TYPE_VIDEO) {
87  fprintf(outfile,
88  "fmt:%s w:%d h:%d tb:%d/%d",
89  desc->name,
90  link->w, link->h,
91  link->time_base.num, link->time_base.den);
92  } else if (link->type == AVMEDIA_TYPE_AUDIO) {
93  char buf[255];
94  av_get_channel_layout_string(buf, sizeof(buf), -1,
95  link->channel_layout);
96  fprintf(outfile,
97  "fmt:%s sr:%d cl:%s tb:%d/%d",
99  link->sample_rate, buf,
100  link->time_base.num, link->time_base.den);
101  }
102  fprintf(outfile, "\" ];\n");
103  }
104  }
105  }
106  fprintf(outfile, "}\n");
107 }
108 
109 int main(int argc, char **argv)
110 {
111  const char *outfilename = NULL;
112  const char *infilename = NULL;
113  FILE *outfile = NULL;
114  FILE *infile = NULL;
115  char *graph_string = NULL;
116  AVFilterGraph *graph = av_mallocz(sizeof(AVFilterGraph));
117  char c;
118 
120 
121  while ((c = getopt(argc, argv, "hi:o:")) != -1) {
122  switch (c) {
123  case 'h':
124  usage();
125  return 0;
126  case 'i':
127  infilename = optarg;
128  break;
129  case 'o':
130  outfilename = optarg;
131  break;
132  case '?':
133  return 1;
134  }
135  }
136 
137  if (!infilename || !strcmp(infilename, "-"))
138  infilename = "/dev/stdin";
139  infile = fopen(infilename, "r");
140  if (!infile) {
141  fprintf(stderr, "Failed to open input file '%s': %s\n",
142  infilename, strerror(errno));
143  return 1;
144  }
145 
146  if (!outfilename || !strcmp(outfilename, "-"))
147  outfilename = "/dev/stdout";
148  outfile = fopen(outfilename, "w");
149  if (!outfile) {
150  fprintf(stderr, "Failed to open output file '%s': %s\n",
151  outfilename, strerror(errno));
152  return 1;
153  }
154 
155  /* read from infile and put it in a buffer */
156  {
157  int64_t count = 0;
158  struct line *line, *last_line, *first_line;
159  char *p;
160  last_line = first_line = av_malloc(sizeof(struct line));
161  if (!last_line) {
162  fprintf(stderr, "Memory allocation failure\n");
163  return 1;
164  }
165 
166  while (fgets(last_line->data, sizeof(last_line->data), infile)) {
167  struct line *new_line = av_malloc(sizeof(struct line));
168  if (!new_line) {
169  fprintf(stderr, "Memory allocation failure\n");
170  return 1;
171  }
172  count += strlen(last_line->data);
173  last_line->next = new_line;
174  last_line = new_line;
175  }
176  last_line->next = NULL;
177 
178  graph_string = av_malloc(count + 1);
179  if (!graph_string) {
180  fprintf(stderr, "Memory allocation failure\n");
181  return 1;
182  }
183  p = graph_string;
184  for (line = first_line; line->next; line = line->next) {
185  size_t l = strlen(line->data);
186  memcpy(p, line->data, l);
187  p += l;
188  }
189  *p = '\0';
190  }
191 
193 
194  if (avfilter_graph_parse(graph, graph_string, NULL, NULL, NULL) < 0) {
195  fprintf(stderr, "Failed to parse the graph description\n");
196  return 1;
197  }
198 
199  if (avfilter_graph_config(graph, NULL) < 0)
200  return 1;
201 
202  print_digraph(outfile, graph);
203  fflush(outfile);
204 
205  return 0;
206 }
AVFilterContext ** filters
Definition: avfilter.h:788
#define NULL
Definition: coverity.c:32
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2263
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
Main libavfilter public API header.
Memory handling functions.
const char * desc
Definition: nvenc.c:101
void av_log_set_level(int level)
Set the log level.
Definition: log.c:391
int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
Check validity and configure all the links and formats in the graph.
int num
Numerator.
Definition: rational.h:59
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:252
struct line * next
Definition: graph2dot.c:50
char data[256]
Definition: graph2dot.c:49
char * name
name of this filter instance
Definition: avfilter.h:312
#define av_malloc(s)
static void print_digraph(FILE *outfile, AVFilterGraph *graph)
Definition: graph2dot.c:53
void avfilter_register_all(void)
Initialize the filter system.
Definition: allfilters.c:40
int main(int argc, char **argv)
Definition: graph2dot.c:109
const char * name
Definition: pixdesc.h:82
unsigned nb_outputs
number of output pads
Definition: avfilter.h:320
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
Definition: graph2dot.c:48
static FilteringContext * filter_ctx
Definition: transcoding.c:46
const char * av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
Return the name of sample_fmt, or NULL if sample_fmt is not recognized.
Definition: samplefmt.c:49
GLsizei count
Definition: opengl_enc.c:109
static void usage(void)
Definition: graph2dot.c:37
audio channel layout utility functions
void av_get_channel_layout_string(char *buf, int buf_size, int nb_channels, uint64_t channel_layout)
Return a description of a channel layout.
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
static int getopt(int argc, char *argv[], char *opts)
Definition: getopt.c:41
void * buf
Definition: avisynth_c.h:690
int avfilter_graph_parse(AVFilterGraph *graph, const char *filters, AVFilterInOut *inputs, AVFilterInOut *outputs, void *log_ctx)
Add a graph described by a string to a graph.
Definition: graphparser.c:459
const char * name
Filter name.
Definition: avfilter.h:148
unsigned nb_filters
Definition: avfilter.h:789
#define snprintf
Definition: snprintf.h:34
const char * avfilter_pad_get_name(const AVFilterPad *pads, int pad_idx)
Get the name of an AVFilterPad.
Definition: avfilter.c:1034
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:319
static double c[64]
int den
Denominator.
Definition: rational.h:60
static char * optarg
Definition: getopt.c:39
An instance of a filter.
Definition: avfilter.h:307
const AVFilter * filter
the AVFilter of which this is an instance
Definition: avfilter.h:310
FILE * outfile
Definition: audiogen.c:96